stock classification

FED 387 · 07-09-2009, 06:27 PM

If the engine factor is 23.08 and the shipping weight is 2770 what/ or how do you figure what class the car falls into??? comp 387

Chuck Norton · 07-09-2009, 06:39 PM

Quote:

Originally Posted by FED 387

If the engine factor is 23.08 and the shipping weight is 2770 what/ or how do you figure what class the car falls into??? comp 387

If it's a V8 = U/S or U/SA

If it's a four or six cylinder = V/S or V/SA

if it's a four cylinder w/added weight = W/S or W/SA

If it's FWD = D/F

FED 387 · 07-09-2009, 06:59 PM

Thank you but do you ever divide pounds per cube or cubes into weight when doing this??? Thanx FED 387

Woodro Josey · 07-09-2009, 07:07 PM

No Sir!

FED 387 · 07-09-2009, 07:24 PM

So 23.08 is how you determine which class you are in AND 2770 is the minumum the car can weigh for that class correct???... At what point does the 170 pound driver figure come into play as part of the 2770 or is it added to the 2770 or is the car weight 2770 LESS 170 to determine the minimum car weight???? Thanx FED387

Tom keedle · 07-09-2009, 07:48 PM

Quote:

Originally Posted by FED 387

Thank you but do you ever divide pounds per cube or cubes into weight when doing this??? Thanx FED 387

well, it's not the cubes that they divide into, it's horsepower (real or factored) but i'm waiting to be eddykated on how the drive weight stuff works.
i havent seem 170 lbs in 30+ years

George Mirza · 07-09-2009, 07:56 PM

The basic formula is Factor x NHRA HP + #170 (driver)= Min. Weight.

The issue here is determining the correct factor for this combo. Like Chuck stated above, if it's a V-8 the heaviest V-8 class is U and the factor is 20.00 or more.

If it's a 4 or 6 cyl. it falls into V and the factor is 22.00 or more. (23.08 listed factor) So you use 22.00 as your factor for V.

Now all you need is the NHRA HP to figure your weight.

FED 387 · 07-09-2009, 08:10 PM

NHRA site lists a 151 cu in 4 cyl engine at 90 hp and a "factor" of 23.08 and a shipping weight of 2770 so it is a V class but what is the least it can weigh??? And do you thnen add the driver or will that weight include a 170 pound driver??? FED387

Mark Yacavone · 07-09-2009, 09:07 PM

Dick , If you want to run V ,which is it's natural class, it's 22 x 90=1980 + 170 = 2150 . I doubt it's that light , but you want to run W anyway, which is a 4 cyl class (24 lbs) (two more lbs per hp) so add 90 twice and you got it.
It's not FWD ,is it? PM me if you want.

Dwight Southerland · 07-10-2009, 09:51 AM

What it seems is confusing you is the additional 170 lbs. added in for the driver. Here is how that works:

For classification purposes only, the shipping weight of the car as supplied by the manufacturer (in this case 2770 lbs) is divided by the power factor (120) to get the power to weight factor (23.04). The power to weight factor and, in this case the engine type (4 cyl), determines the classification. Since there is no 23 lb/hp class, you can adjust weight to make either V (22 lb/hp) or W (24 lb/hp) .

For actual race weight, the tech guys will calculate the class factor for V (22) or W (24) times the power factor (120) to get the minimum weight for the class. 22 x 120 = 2640 for V, or 24 x 120 = 2880 for W. Then they will add 170 for the driver and the total is the amount the car must weigh when it goes across the scales with the driver in it . For a V car, 2640 + 170 = 2810 lbs; for a W car, 2880 + 170 = 3050 lbs. It does not matter that the driver actually weighs 170 lbs, just that the scale weight is correct with the driver in the car.

I am assuming you are looking at a 1982 Camaro with the 151 4-cylinder factory rated at 90 hp and NHRA factored at 120.

07-09-2009, 06:59 PM	#3
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,409 Likes: 504 Liked 329 Times in 177 Posts	Re: stock classification Thank you but do you ever divide pounds per cube or cubes into weight when doing this??? Thanx FED 387

07-09-2009, 07:07 PM	#4
Woodro Josey Senior Member Join Date: Jul 2007 Posts: 805 Likes: 0 Liked 3 Times in 1 Post	Re: stock classification No Sir! __________________ Woodro Josey 2002 STK

07-09-2009, 07:24 PM	#5
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,409 Likes: 504 Liked 329 Times in 177 Posts	Re: stock classification So 23.08 is how you determine which class you are in AND 2770 is the minumum the car can weigh for that class correct???... At what point does the 170 pound driver figure come into play as part of the 2770 or is it added to the 2770 or is the car weight 2770 LESS 170 to determine the minimum car weight???? Thanx FED387

07-09-2009, 07:56 PM	#7
George Mirza Senior Member Join Date: Jan 2002 Location: North Attleborough Ma. Posts: 522 Likes: 0 Liked 0 Times in 0 Posts	Re: stock classification The basic formula is Factor x NHRA HP + #170 (driver)= Min. Weight. The issue here is determining the correct factor for this combo. Like Chuck stated above, if it's a V-8 the heaviest V-8 class is U and the factor is 20.00 or more. If it's a 4 or 6 cyl. it falls into V and the factor is 22.00 or more. (23.08 listed factor) So you use 22.00 as your factor for V. Now all you need is the NHRA HP to figure your weight.

07-09-2009, 08:10 PM	#8
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,409 Likes: 504 Liked 329 Times in 177 Posts	Re: stock classification NHRA site lists a 151 cu in 4 cyl engine at 90 hp and a "factor" of 23.08 and a shipping weight of 2770 so it is a V class but what is the least it can weigh??? And do you thnen add the driver or will that weight include a 170 pound driver??? FED387

07-09-2009, 06:27 PM	#1
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,409 Likes: 504 Liked 329 Times in 177 Posts	stock classification If the engine factor is 23.08 and the shipping weight is 2770 what/ or how do you figure what class the car falls into??? comp 387

07-09-2009, 09:07 PM	#9
Mark Yacavone Veteran Member Join Date: Mar 2002 Location: Miles From Nowhere Posts: 7,788 Likes: 2,878 Liked 5,076 Times in 1,935 Posts	Re: stock classification Dick , If you want to run V ,which is it's natural class, it's 22 x 90=1980 + 170 = 2150 . I doubt it's that light , but you want to run W anyway, which is a 4 cyl class (24 lbs) (two more lbs per hp) so add 90 twice and you got it. It's not FWD ,is it? PM me if you want. __________________ "We are lucky we don't get as much Government as we pay for." Will Rogers

07-10-2009, 09:51 AM	#10
Dwight Southerland VIP Member Join Date: Dec 2001 Location: Arkansas - In the middle of everything. Posts: 1,999 Likes: 63 Liked 772 Times in 192 Posts	Re: stock classification What it seems is confusing you is the additional 170 lbs. added in for the driver. Here is how that works: For classification purposes only, the shipping weight of the car as supplied by the manufacturer (in this case 2770 lbs) is divided by the power factor (120) to get the power to weight factor (23.04). The power to weight factor and, in this case the engine type (4 cyl), determines the classification. Since there is no 23 lb/hp class, you can adjust weight to make either V (22 lb/hp) or W (24 lb/hp) . For actual race weight, the tech guys will calculate the class factor for V (22) or W (24) times the power factor (120) to get the minimum weight for the class. 22 x 120 = 2640 for V, or 24 x 120 = 2880 for W. Then they will add 170 for the driver and the total is the amount the car must weigh when it goes across the scales with the driver in it . For a V car, 2640 + 170 = 2810 lbs; for a W car, 2880 + 170 = 3050 lbs. It does not matter that the driver actually weighs 170 lbs, just that the scale weight is correct with the driver in the car. I am assuming you are looking at a 1982 Camaro with the 151 4-cylinder factory rated at 90 hp and NHRA factored at 120. Last edited by Dwight Southerland; 07-10-2009 at 09:54 AM.